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MIMO OFDM is a key technique for achieving high data rate in future wireless communication systems. The desired low-cost, low-power and fully integrated implementation of MIMO OFDM systems leads to the application of direct (up/down) conversion architecture, whose performance can be seriously limited by I/Q-imbalance. Thus, the compensation of I/Q-imbalance is a crucial issue in the implementation...
The compensation of frequency selective I/Q-imbalance and modulator (MOD) offset error can improve the performance of direct-conversion transmitters significantly. For effective compensation of these two effects, the parameter estimation is crucial. In many applications, ``semi-blind'' estimation is desired i.e. not dedicated pilot signals but the communication signals are used for estimation. Conventionally,...
This paper takes soft capsule dropping pills pharmaceutical production process as the research object. In order to improve the yield of soft capsule dropping pills and its stability of product quality, the modeling and optimizing control are studied based on intelligent control, data-driven modeling and intelligent optimizing algorithms. Firstly, the soft capsule dropping pills pharmaceutical production...
MIMO OFDM is a very promising technique for high-speed wireless transmission. By applying the Direct Conversion Architecture (DCA), low-cost, low-power and fully integrated implementation of such systems is enabled. However, the performance of DCA may be seriously limited by I/Q-imbalance, which shows frequency selectivity in broadband systems. In this paper, we consider an indoor scenario and present...
Soft capsule dropping pills product quality control system is a multi-input and multi-output complex system. First of all, the process parameters and a two-level hierarchy index system of soft capsule pills product quality were proposed based on the analysis to the production process. Then the model was established based on least squares support vector machine (LSSVM), whose inputs are the process...
In this paper, channel estimation schemes as well as low crest-factor preamble construction are presented for practical MIMO OFDM systems with NULL subcarriers. In the presence of NULL subcarriers, the performance of the channel estimator in [1] degrades considerably. Therefore, Maximum-likelihood (ML) channel estimators were proposed for MIMO OFDM systems with NULL subcarriers [2], [3]. However,...
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